Which urine finding is most indicative of glomerular disease?

Which urine finding is most indicative of glomerular disease?

• A. Red blood cell casts
• B. White blood cell casts
• C. Proteinuria
• D. Broad, muddy brown casts

Answer: (A)

Red blood cell casts are most indicative of glomerular disease because they reflect damage to the glomerular filtration barrier with leakage of RBCs into the filtrate, which then form casts in the tubules. Their presence is fairly specific for glomerular pathology such as glomerulonephritis or vasculitis. White blood cell casts point to tubulointerstitial inflammation or infection rather than primary glomerular disease. Proteinuria can occur with glomerular injury due to increased permeability, but it is not as specific as RBC casts and can be seen in many conditions. Broad, muddy brown casts are typical of acute tubular necrosis, not glomerular disease. So the red blood cell casts best signal glomerular injury.

Red blood cell casts are most indicative of glomerular disease because they reflect damage to the glomerular filtration barrier with leakage of RBCs into the filtrate, which then form casts in the tubules. Their presence is fairly specific for glomerular pathology such as glomerulonephritis or vasculitis.

White blood cell casts point to tubulointerstitial inflammation or infection rather than primary glomerular disease. Proteinuria can occur with glomerular injury due to increased permeability, but it is not as specific as RBC casts and can be seen in many conditions. Broad, muddy brown casts are typical of acute tubular necrosis, not glomerular disease.

So the red blood cell casts best signal glomerular injury.